I wouldn't worry about this too much. Personal statements are there for you to show your drive and passion as a student and present yourself to the university. While SPAG is good to keep consistent, I don't think your acceptance will be determined on two little spelling errors and it may not be noticed.
Since you have already submitted I wouldn't focus on it as all you can do is wait. Just focus on other things such as schoolwork, hobbies etc and don tlet yourself get too worried about some mistakes.
Good luck with everything,
- Sophie (uni of Bath)